/*
 * SlipAreaChart.java
 * Android-Charts
 *
 * Created by limc on 2014.
 *
 * Copyright 2011 limc.cn All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.limc.ohoscharts.view;


import cn.limc.ohoscharts.common.IFlexableGrid;
import cn.limc.ohoscharts.entity.DateValueEntity;
import cn.limc.ohoscharts.entity.LineEntity;
import ohos.agp.components.AttrSet;
import ohos.agp.components.Component;
import ohos.agp.render.Canvas;
import ohos.agp.render.Paint;
import ohos.agp.render.Path;
import ohos.agp.utils.Color;
import ohos.app.Context;

import java.util.List;

/**
 * <p>
 * en
 * </p>
 * <p>
 * jp
 * </p>
 * <p>
 * cn
 * </p>
 *
 * @author limc
 * @version v1.0 2014/01/22 16:19:37
 */
public class SlipAreaChart extends SlipLineChart {

  /**
   * <p>
   * Constructor of SlipAreaChart
   * </p>
   * <p>
   * SlipAreaChart类对象的构造函数
   * </p>
   * <p>
   * SlipAreaChartのコンストラクター
   * </p>
   *
   * @param context
   * @param attrs
   * @param defStyle
   */
  public SlipAreaChart(Context context, AttrSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    // TODO Auto-generated constructor stub
  }

  /**
   * <p>
   * Constructor of SlipAreaChart
   * </p>
   * <p>
   * SlipAreaChart类对象的构造函数
   * </p>
   * <p>
   * SlipAreaChartのコンストラクター
   * </p>
   *
   * @param context
   * @param attrs
   */
  public SlipAreaChart(Context context, AttrSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
  }

  /**
   * <p>
   * Constructor of SlipAreaChart
   * </p>
   * <p>
   * SlipAreaChart类对象的构造函数
   * </p>
   * <p>
   * SlipAreaChartのコンストラクター
   * </p>
   *
   * @param context
   */
  public SlipAreaChart(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
  }

  /*
   * (non-Javadoc)
   *
   * <p>Called when is going to draw this chart<p> <p>チャートを書く前、メソッドを呼ぶ<p>
   * <p>绘制图表时调用<p>
   *
   * @param canvas
   *
   * @see ohos.view.View#onDraw(ohos.graphics.Canvas)
   */

  @Override
  public void onDraw(Component component, Canvas canvas) {
    super.onDraw(component, canvas);
    // draw lines
    drawAreas(canvas);
  }

  /**
   * <p>
   * draw lines
   * </p>
   * <p>
   * ラインを書く
   * </p>
   * <p>
   * 绘制线条
   * </p>
   *
   * @param canvas
   */
  protected void drawAreas(Canvas canvas) {
    if (null == linesData) {
      return;
    }
    // distance between two points
    float lineLength;
    // start point‘s X
    float startX;

    // draw lines
    for (int i = 0; i < linesData.size(); i++) {
      LineEntity<DateValueEntity> line = (LineEntity<DateValueEntity>) linesData.get(i);
      if (line == null) {
        continue;
      }
      if (line.isDisplay() == false) {
        continue;
      }
      List<DateValueEntity> lineData = line.getLineData();
      if (lineData == null) {
        continue;
      }

//			RgbColor rgbColor = new RgbColor(RgbColor.fromArgbInt(line.getLineColor()));

      Paint mPaint = new Paint();
      mPaint.setColor(new Color(line.getLineColor()));
      mPaint.setAlpha(0.2f);
      mPaint.setAntiAlias(true);

      // set start point’s X
      if (lineAlignType == IFlexableGrid.ALIGN_TYPE_CENTER) {
        lineLength = (dataQuadrant.getPaddingWidth() / displayNumber);
        startX = dataQuadrant.getPaddingStartX() + lineLength / 2;
      } else {
        lineLength = (dataQuadrant.getPaddingWidth() / (displayNumber - 1));
        startX = dataQuadrant.getPaddingStartX();
      }

      Path linePath = new Path();
      for (int j = displayFrom; j < displayFrom + displayNumber; j++) {
        float value = lineData.get(j).getValue();
        // calculate Y
        float valueY = (float) ((1f - (value - minValue)
            / (maxValue - minValue)) * dataQuadrant.getPaddingHeight())
            + dataQuadrant.getPaddingStartY();

        // if is not last point connect to previous point
        if (j == displayFrom) {
          linePath.moveTo(startX, dataQuadrant.getPaddingEndY());
          linePath.lineTo(startX, valueY);
        } else if (j == displayFrom + displayNumber - 1) {
          linePath.lineTo(startX, valueY);
          linePath.lineTo(startX, dataQuadrant.getPaddingEndY());
        } else {
          linePath.lineTo(startX, valueY);
        }
        startX = startX + lineLength;
      }
      linePath.close();
      canvas.drawPath(linePath, mPaint);
    }
  }
}
